Tomichia cawstoni
| Tomichia cawstoni | |
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| Species: | T. cawstoni
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| Binomial name | |
| Tomichia cawstoni Connolly, 1939
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Tomichia cawstoni is a species of very small freshwater snails which have a gill and an operculum, gastropod mollusks or micromollusks in the family Pomatiopsidae.
Distribution
This species is endemic to South Africa.[1] The type locality is Kokstad, KwaZulu-Natal, Eastern Cape Province, South Africa.[2]
Description
The width of the shell is 2.5 mm.; the height of the shell is 4.6 mm. Spire short, and flat sided. Whorls weakly convex.[2]
Ecology
The natural habitat for this species is rivers in riverine forests, predominantly of freshwater in contrast to other species which inhabit ephemeral streams and rivers.[1][3]
Threats
Species of the genus Tomichia are particularly susceptible to changes in their ecosystem, and thus species such as Tomichia cawstoni are greatly threatened by pollution and climatic changes (especially in the form of changes in rain cycles). In Kokstad, it is threatened by pollution and trampling from commercial cattle farming operations. All suitable locations for this species' inhabitance have since been found destroyed, restricting the species to the type locality.
References
- ^ a b c Kristensen T. K., Stensgaard A-S. & Appleton C. (2007). Tomichia cawstoni. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.4. www.iucnredlist.org. Downloaded on 30 May 2011.
- ^ a b Brown D. S. (1994). Freshwater Snails of Africa and their Medical Importance. Taylor & Francis. ISBN 0-7484-0026-5.
- ^ Brooks, E. G. E.; Allen, David James; Darwall, W. R. T. (2011). The Status and Distribution of Freshwater Biodiversity in Central Africa. IUCN. ISBN 9782831713267.
External links
- Davis G. M. (1981). "Different modes of evolution and adaptive radiation in the Pomatiopsidae (Prosobranchia: Mesogastropoda)". Malacologia 21: 209-262.